Digital textile printer

ABSTRACT

A digital textile printer includes front and rear feeding devices driven by a transfer axil within a driving panel of the front and the rear of a base to prevent distortion and wrinkle phenomena generating defective printing to perform effectively the textile printing even to very thin textile fabrics, an ink-retrieving hole along to the transfer axil on the top of the base to collect the residues of the injected ink passing through a printing material to prevent ink from spreading at the printing material, at least one suction pan in the inside of the base to collect easily the residues of the injected ink to hasten dries of ink, and a heater of rubber material in the inside of the front of the base to hasten dries of the printing material passing through the ink-retrieving hole.

BACKGROUND OF THE INVENTION

The present invention relates to a digital textile printer, and moreparticularly a printer performing effectively not only general printingoperations to a relatively thick printing material (textile fabrics orpapers), such as a banner, an advertising material, or a photograph, butalso textile printing operations to very thin printing material, such astextile fabrics.

Generally, in the conventional printer utilizing a technique ofsubtractive mixture, a digital controller sends digitalized signals to ahead of the printer, so that the head may inject proper amounts of inkof three primary colors comprising magenta, yellow, and cyan, and of ablack color to a printing material to produce various color tones.Therefore, the latest printer makes it possible for a user to designmore easily what she/he wants.

In the technique of subtractive mixture, the head of the printer isequipped with several ink reservoirs, while each ink reservoir containsone color respectively. The head injects proper amounts of ink from eachreservoir to produce a new color tone. The head is often furtherequipped with another ink reservoir containing special color to producea new color tone, if necessary.

By referencing FIG. 1 and FIG. 2, the conventional digital printer willbe described briefly in the following statements.

The conventional printer includes a transfer belt 5 with a rail shape onthe top of a base 3, while the base 3 is supported by legs 1 contactingwith the ground. The one side of a cartridge 9 is fixed with thetransfer belt 5, so that a head 7 of the cartridge 9 can be moved viathe transfer belt 5. In addition, a transfer axil 50 is connected with atransfer motor (not shown) within a driving panel 18 installed in theone side of the inner upper side of the base 3. Additionally, severaltransfer rollers 51 on the transfer axil 50 are extruded on the top ofthe base 3 to make a printing material 17 move to the forward direction,while a press roller 40 equipped correspondingly on the top of eachtransfer roller 51 presses the printing material 17 to the downwarddirection.

In addition, a feeding roller 11 installed in the rear side of thedigital printer supplies the printing material 17 to the top of the base3. When the cartridge 9 moves reciprocally to the left or the rightdirection on the top of the printing material 17, the head 7 moving incombination with the cartridge 9 injects predetermined amounts of eachcolor from the corresponding ink reservoir to perform printingoperations. As a result, the printed material is recoiled in a rewindingroller 12 located on the opposite side of the feeding roller 11.

An operation panel 16 covered by a cover 15 is equipped on the top ofthe base 3. Therefore, a user can input any desirable signal to beprinted in the printing material 17.

In other words, as shown in FIG. 2, the printing material 17 issuspended to the feeding roller 11 in the rear of a fixing frame 10between the legs 1, and the end of the printing material 17 passesthrough the top of the base 3 supported by the legs 1. In addition, therewinding roller 12 winding the printing material 17 printed at the base3 is in the front of the fixing frame 10.

However, the conventional printer described in the above statements hasthe following problems. After the printing material 17 is put betweenthe several transfer rollers 51 and press rollers 40, the transferroller 51 rotates to make the printing material 17 move to the frontside of the base 3. When the printing material 17 is extremely thin, forexample, in the case of textile printing, the speed of the printingmaterial 17 passing through between the transfer rollers 51 and thepress rollers 40 is different from that of the printing material 17before the transfer roller 51. Therefore, a portion of the printingmaterial 17 is often wrinkled, and the wrinkled moving printing material17 has a tendency of inclining toward one direction only. As a result,when the printing material 17 is distorted or wrinkled, printing colorsare overlapped resulting in a high fraction of defective results of theprinting operations.

Additionally, the conventional digital printer does not have a feedingmeans drawing and rewinding the printing material 17 in constant speedto maintain the printing material 17 in a plane. Therefore, thedistortion or the wrinkle of the printing material 17 is deepened moreto increase the fraction of defective results of the printing operation.

SUMMARY OF THE INVENTION

To overcome the above described problems, the present invention providesa digital textile printer comprising the front rewinding and the rearfeeding devices, at the front and the rear of the base, driven by atransfer axil in a driving panel, winding a printing material to arewinding roller in a constant tension force, preventing defectiveprinting operations generated by distorting or wrinkling phenomena ofthe printing material, and performing effective textile printing to thevery thin textile fabrics eventually.

In addition, the present invention provides a digital textile printercomprising an elongated ink-retrieving hole, on the top of the base,collecting the residues of the injected ink passing through the printingmaterial to prevent the printing material from ink contamination or inksmearing.

Additionally, the present invention provides a digital textile printercomprising a heater of rubber material, in the inside of the front ofthe base, drying promptly the printing material passing through theink-retrieving hole.

To achieve the above described purpose, the present invention disclosesa digital textile printer with a transfer belt having a rail shape onthe top of the base supported by both legs contacted with the ground, acartridge transferable through the transfer belt and fixing a head unitat the one side of the cartridge, a transfer axil with an elongatedshape coupled with a transfer motor in a driving panel installed on thetop of the inside of a base, multiple transfer rollers of the transferaxil protruding to the top of the base to make a printing material moveto the forward direction, a feeding roller means installed in the rearof the base sending the printing material through the top of the base, arewinding roller means rewinding the printing material from the top ofthe base, comprising: at least one rear guiding roller means at the rearof the base, coupled with the transfer axil; a rear feeding deviceincluding a rear tension means at the bottom of the rear of the legs torotate eccentrically in a predetermined angle, a rear position sensorinstalled at a predetermined position of the rear tension means tocorrespond to a rear eccentric axil of the rear tension means windingthe printing material, and a feeding motor installed on the top of therear tension means to drive a rear bobbin axil of the feeding rollermeans combined with a rear bobbin feeding the printing material byreceiving signals from the rear position sensor; at least one frontguiding roller means at the front of the base, linked with the transferaxil; and a front rewinding device including a front tension means atthe bottom of the front of the legs to rotate eccentrically in apredetermined angle, a front position sensor installed at apredetermined position of the front tension means to correspond to afront eccentric axil of the front tension means winding the printingmaterial, and a rewinding motor installed on the top of the fronttension means to drive a front bobbin axil of the rewinding roller meanscombined with a front bobbin rewinding the printing material byreceiving signals from the front position sensor.

In addition, the front tension means installed at the front of thebottom of the legs, comprises: front fixtures facing each other at thefront of two legs; a front rotation axil installed eccentrically betweentwo front brackets with a predetermined length, penetrating two frontbrackets, and both ends of the front rotation axil combined with thefront fixtures; and a front eccentric axil, corresponding to theprinting material, apart in a predetermined distance from the frontrotation axil between the two front brackets.

Additionally, the rear tension means installed at the rear of the bottomof the legs, comprises: rear fixtures facing each other at the rear oftwo legs; a rear rotation axil installed eccentrically between two rearbrackets with a predetermined length, penetrating two rear brackets, andboth ends of the rear rotation axil combined with the rear fixtures; anda rear eccentric axil, corresponding to the printing material, apart ina predetermined distance from the rear rotation axil between the tworear brackets.

Further, the front guiding roller means further comprises multiple frontrollers coupled with the transfer belt of the transfer axil and combinedwith at least one front tension axil.

In addition, the rear guiding roller means further comprises multiplerear rollers coupled with the transfer belt of the transfer axil andcombined with at least one rear tension axil.

Further, the diameter of the front roller of the front guiding rollermeans linked directly with the transfer axil is slightly larger than thediameter of the rear roller of the rear guiding roller means.

Additionally, the digital textile printer further comprises anink-retrieving hole in an elongated shape on the top of the base tocollect the residues of the injected ink passing though the printingmaterial.

In addition, the digital textile printer further comprises a heater ofrubber material at the inside of the base to dry promptly the printingmaterial. In addition, the digital textile printer according to claim 1,further comprises: multiple front adjusting holes between the two frontbrackets; and a front tension adjusting axil installed in one of themultiple front adjusting holes to balance with the weight of the fronteccentric axil, and eventually to adjust tension strength of the fronteccentric axil.

Further, the digital textile printer according to claim 1, furthercomprises: multiple rear adjusting holes between the two rear brackets;and a tension rear adjusting axil installed in one of the multiple rearadjusting holes to balance with the weight of the rear eccentric axil,and eventually to adjust tension strength of the rear eccentric axil.

For a more complete understanding of the present invention and theadvantages thereof, reference is now made to the following descriptionstaken in conjunction with the accompanying drawings, in which likereference numerals denote like parts.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the conventional printer;

FIG. 2 is a schematic view of the transferring states of a printingmaterial of FIG. 1;

FIG. 3 is a perspective view of the front of a digital textile printerof the present invention;

FIG. 4 is a cross sectional view of the main part of the digital textileprinter through the line A-A according to the present invention;

FIG. 5 is a perspective view of the rear of the digital textile printerof the present invention;

FIG. 6 is a perspective view of the main part of a guiding roller meansof the present invention; and

FIG. 7 is a schematic view describing the printing states of a printingmaterial according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to preferred embodiments of thepresent invention, example of which is illustrated in the accompanyingdrawings.

FIG. 3 is a perspective view of the front of a large sized printer, andFIG. 5 is a perspective view of the rear of the large sized printeraccording to the present invention.

A digital textile printer comprises a transfer belt 200 with a railshape on the top of a base 110 supported by both legs 100 contacted withthe ground. The transfer belt 200 is combined with a cartridge (notshown), while the cartridge is movable through the transfer belt and ahead unit (not shown) is fixed with the one side of the cartridge.

As shown in FIG. 6, a driving panel 120 at the top of the one side ofthe base 110 comprises a transfer motor 121 and a transfer axil 122. Thetransfer axil 122 is combined with a transfer motor 121, and installedin long direction within the base 110. As shown in FIG. 3, the transferaxil 122 includes multiple transfer rollers 123 protruding to the top ofthe base 110. A press rod 124 is on the top of the transfer roller 123,and each press rod 124 corresponds to each transfer roller 123respectively to transfer a printing material 800 to the forwarddirection. A handle lever 126 comprised in an operation panel 130 drivesthe press rod 124.

As shown in FIG. 5, a rear feeding device 600 installed in the rear ofthe base 110 comprises a rear tension means 610, at the bottom of therear of the leg 100, rotatable eccentrically in a predetermined angle. Arear position sensor 616 corresponding to a rear eccentric axil 615winding the printing material 800 is installed in a predeterminedposition of the top of the tension means 610. A feeding roller means 630on the top of the rear tension means 610 comprises a bobbin axil 631coupled with a bobbin (not shown) winding the printing material 800, anda feeding motor 632 driven by signals from the rear position sensor 616.

The rear tension means 610 comprises rear fixtures 611 facing each otherat the rear of both legs 100, two rear brackets 612 with a predeterminedlength, a bearing 613, a rotation axil 614, and a rear eccentric axil615. While the rotation axil 614 is installed in eccentric between tworear brackets 612, the one end of the rotation axil 614 is connectedwith the rear fixture 611, and the other end of the rotation axil 614 isconnected with the bearing 613. In addition, the rear eccentric axil 615corresponding to the printing material 800 is between two rear brackets612, and maintains a predetermined distance from the rotation axil 614.

In other words, when the printing material 800 is wound to cause therear bracket 612 to lift up to the direction of the arrow mark in FIG.7, and the rear position sensor 616 detects the rear bracket 612oriented like the dotted line in FIG. 7. Sequentially, the rear positionsensor 616 receives signals to rotate the feeding motor 632, andsupplies the printing material 800 in the bobbin coupled with the bobbinaxil 631 to the forward direction. As a result, the rear eccentric axil615 of the rear tension means 610 falls down to the downward directionlike the solid line in FIG. 7.

In addition, multiple adjusting holes 618 are formed between two rearbrackets 612, and a rear tension adjusting axil 617 installed in one ofthe multiple adjusting holes 618 is controlled to be balanced with theweight of the rear eccentric axil 615, and eventually to adjust tensionstrength of the rear eccentric axil 615.

As shown in FIG. 5 and FIG. 6, a rear guiding roller means 640 linkedwith the transfer axil 122 and installed in the rear of the base 110,comprises a first roller 642, a second roller 643, and a third roller644 in two brackets 641 of both sides of the base 110 in adjacent and ina predetermined height difference. In addition, pulleys 642 a and 643 aof the first and the second rollers 642 and 643 are coupled with apulley 125 of the transfer axil 122 by means of a belt 646. Pulleys 645a and 647 a of two tension axils 645 and 647 installed in a bracket 641are connected with the belt 646, and make the belt 646 maintain constanttension force always.

As described in the above statements, the existing transfer axil 122 isused to drive the rear feeding device 600. Therefore, it is possible toembody a simple structure of the printing machine and to lower raw costsof manufacturing the printing machine.

As shown in FIG. 3, a front rewinding device 500 installed in the frontof the base 110 comprises a front tension means 510, at the bottom ofthe front of the leg 100, rotatable eccentrically in a predeterminedangle. A front position sensor 516 corresponding to a front eccentricaxil 515 winding the printing material 800 is installed in apredetermined position of the top of the front tension means 510. Arewinding roller means 550 on the top of the front tension means 510comprises a bobbin axil 551 coupled with a bobbin (not shown) windingthe printing material 800, and a rewinding motor 552 driven by signalsfrom the front position sensor 516.

The front tension means 510 comprises front fixtures 511 facing eachother at the front of both legs 100, two front brackets 512 with apredetermined length, a bearing 513, a rotation axil 514, and a fronteccentric axil 515. While the rotation axil 514 is installed ineccentric between two front brackets 512, the one end of the rotationaxil 514 is connected with the front fixture 511, and the other end ofthe rotation axil 514 is connected with the bearing 513. In addition,the front eccentric axil 515 corresponding to the printing material 800is between two front brackets 512, and maintains a predetermineddistance from the rotation axil 514.

In addition, multiple adjusting holes 518 are formed between two frontbrackets 512, and a front tension adjusting axil 517 installed in one ofthe multiple adjusting holes 518 is controlled to be balanced with theweight of the front eccentric axil 515, and eventually to adjust tensionstrength of the front eccentric axil 515.

As shown in FIG. 3 and FIG. 6, a front guiding roller means 530 linkedwith the transfer axil 122 and installed in the front of the base 110,comprises a first roller 532 and a second roller 533 in two brackets 531of both sides of the base 110 in adjacent and in a predetermined heightdifference. In addition, a pulley 532 a of the first roller 532 iscoupled with the pulley 125 of the transfer axil 122 by means of a belt540. In other words, the existing transfer axil 122 is used to drive thefront rewinding device 500 without extra driving means. Therefore, it ispossible not only to embody a simple structure of the printing machine,but also to maintain high accuracy.

As shown in FIG. 7, because of loads of the front eccentric axil 515 ofthe front tension means 510 and of the rear eccentric axil 615 of therear tension means 610, the printing material 800 between them istightened. Therefore, distortion or wrinkle of the printing material 800is prevented. In addition, the diameter of the first roller 532 of thefront guiding roller means 530 is slightly larger than that of the firstroller 642 of the rear guiding roller means 640. Therefore, the printingmaterial 800 is pulled out to the front direction by constant force.

As shown in FIG. 3, it is preferable to form an elongated ink-retrievinghole 140 on the top of the base 110 to collect the residues of theinjected ink passing through the printing material 800. As shown in FIG.4, it is preferable to form at least one suction pan 150 in the insideof the base to collect easily the residues of the injected ink passingthrough the printing material 800, and to form a heater 160 of rubbermaterial at the bottom of the base 110 to dry promptly the printingmaterial 800 passing through the ink-retrieving hole 140.

Operations of the digital textile printing machine of the presentinvention will be described in the following statements.

To install the printing material 800 to the digital textile printingmachine, the printing material 800 is pulled out from the bobbincombined with the bobbin axil 631 of the feeding roller means 630 atfirst, as shown in FIG. 5. Sequentially, the edge of the printingmaterial 800 passes though the rear eccentric axil 615 of the reartension mean 610, the third roller 644, the second roller 643, the firstroller 642, the base 110, the first roller 532, the second roller 533,the front eccentric axil 515, and finally the bobbin axil 551 of therewinding roller means 550, as shown in FIG. 7.

When the digital textile printing machine is operated, the transfer axil122 linked with the transfer motor 121 in the driving panel 120 becomesto rotate, and the transfer roller 123 of the transfer axil 122 makesthe printing material 800 move to the forward direction. Simultaneously,the first rollers 532 and 642 and the second roller 643 of the front andthe rear guiding roller means 530 and 640 linked with the transfer axil122 also rotate to make the printing material 800 move to the forwarddirection.

Meanwhile, the rewinding motor 552 of the rewinding roller means 550rotates to wind the printing material to the bobbin like shown by thesolid line in FIG. 7. At this moment, the rotation of the rewindingmotor 552 lifts up the bracket 512 including the front eccentric axil515. Simultaneously, when the bracket 512 reaches to the position of thefront position sensor 516, signals are sent to the front position sensor516 to suspend rotation of the rewinding motor 552.

As shown in FIG. 7, because of loads of the front eccentric axil 515 ofthe front tension means 510 and of the rear eccentric axil 615 of therear tension means 610, the printing material 800 between them istightened. Therefore, distortion or wrinkle of the printing material 800is prevented. In addition, the diameter of the first roller 532 of thefront guiding roller means 530 is slightly larger than that of the firstroller 642 of the rear guiding roller means 640. Therefore, the printingmaterial 800 is pulled out to the front direction by constant force.

In addition, when the printing material 800 is wound to make the rearbracket 612 lifted up to the direction of the arrow mark in FIG. 7, andthe rear position sensor 616 detects the rear bracket 612 as orientedlike the dotted line in FIG. 7. Sequentially, the rear position sensor616 receives signals to rotate the feeding motor 632, and supplies theprinting material 800 in the bobbin coupled with the bobbin axil 631 tothe forward direction. As a result, the rear eccentric axil 615 of therear tension means 610 falls down to the downward direction like shownby the solid line in FIG. 7.

In other words, the rewinding motor 552 winds the printing material 800only when the front position sensor 516 sends signals to the rewindingmotor 552. In addition, the feeding motor 632 supplies the printingmaterial 800 only when the rear position sensor 616 sends signals to thefeeding motor 632. Such processes are repeated over and over again.

The ink-retrieving hole 140 is formed on the top of the base 110 tocollect effectively the residues of the injected ink passing through theprinting material 800 to prevent ink from spreading, as shown in FIG. 3,and the suction pan 150 in the inside of the base 110 collects easilythe residues of the injected ink passing though the printing material800, as shown in FIG. 4. In addition, the heater 160 in the inside ofthe front of the base 110 dries promptly the printing material 800simultaneously.

As described in the above statements, the digital textile printingmachine of the present invention comprises the front rewinding and therear feeding devices 500 and 600 driven by the transfer axil 122 withinthe driving panels of the front and the rear of the base 110. Therefore,the printing material 800 is wound on a roller in the states of constanttension forces to prevent distortion and wrinkle phenomena generatingdefective printing. As a result, it is possible to perform effectivelythe textile printing even to the very thin textile fabrics.

Additionally, the digital textile printing machine of the presentinvention comprises an elongated ink-retrieving hole 140 along to thetransfer axil 122 on the top of the base 110 to collect the residues ofthe injected ink passing through the printing material 800 to preventink from spreading at the printing material 800.

In addition, the digital textile printing machine of the presentinvention comprises at least one suction pan 150 in the inside of thebase 110 to collect easily the residues of the injected ink to hastendries of ink.

Additionally, the digital textile printing machine of the presentinvention comprises the heater 160 of rubber material in the inside ofthe front of the base 110 to hasten dries of the printing material 800passing through the ink-retrieving hole.

While the invention has been particularly shown and described withreference to preferred embodiments thereof, it will be understood bythose skilled in the art that the foregoing and other changes in formand details may be made therein without departing from the spirit andscope of the invention.

1. A digital textile printer, comprising: a base supported by legs onthe ground; a transfer belt being disposed on the base; a cartridgebeing transferable via the transfer belt; a head unit being fixed at oneside of the cartridge; a driving panel being installed on the top of thebase; a transfer motor being housed in said driving panel; a transferaxil having an elongated shape being coupled with said transfer motor;transfer rollers being disposed on the transfer axil, said transferrollers protruding to a top of the base for moving a printing materialin a forward direction; a feeding roller mechanism being installed in arear of the base, said feeding roller mechanism being operable to sendthe printing material through the top of the base, said feeding rollermechanism including a rear bobbin axil; a rewinding roller mechanismoperable for rewinding the printing material from the top of the base;at least one rear guiding roller mechanism being disposed at the rear ofthe base, said at least one rear guiding roller mechanism being coupledwith the transfer axil; a rear feeding device including a rear tensionmechanism which is disposed at a bottom of the rear of the legs operableto rotate eccentrically in a predetermined angle, a rear position sensorinstalled at a predetermined position of the rear tension mechanism tocorrespond to a rear eccentric axis of the rear tension mechanismwinding the printing material, and a feeding motor installed on the topof the rear tension mechanism operable to drive said rear bobbin axilcombined with a rear bobbin operable to feed the printing material byreceiving signals from the rear position sensor; at least one frontguiding roller mechanism being disposed at the front of the base, linkedwith the transfer axil; and a front rewinding device including a fronttension mechanism which is disposed at the bottom of the front of thelegs operable to rotate eccentrically in a predetermined angle, a frontposition sensor installed at a predetermined position of the fronttension mechanism to correspond to a front eccentric axis of the fronttension mechanism winding the printing material, and a rewinding motorinstalled on the top of the front tension mechanism to drive a frontbobbin axis of the rewinding roller mechanism combined with a frontbobbin rewinding the printing material by receiving signals from thefront position sensor.
 2. The digital textile printer according to claim1, wherein the front/rear tension mechanism installed at the front/rearof the bottom of the legs, comprises: front/rear fixtures facing eachother at the front of the legs; a front/rear rotation axil installedeccentrically between two front/rear brackets with a predeterminedlength, penetrating two front/rear brackets, and both ends of thefront/rear rotation axil combined with the front/rear fixtures; and afront/rear eccentric axil, corresponding to the printing material, apartin a predetermined distance from the front/rear rotation axil betweenthe two front/rear brackets.
 3. The digital textile printer according toclaim 1, wherein the front/rear guiding roller mechanisms each furthercomprises multiple front/rear rollers coupled with the transfer belt ofthe transfer axil and combined with at least one front/rear tensionaxil.
 4. A digital textile printer, comprising: a base; legs contactedwith the ground which support said base; a transfer belt having a railshape being disposed on a top of the base; a cartridge beingtransferable via the transfer belt; a head unit being fixed at a side ofthe cartridge; a driving panel being installed on the top of the base; atransfer motor being housed in said driving panel; a transfer axilhaving an elongated shape being coupled with said transfer motor;multiple transfer rollers being disposed on the transfer axil, saidtransfer rollers protruding to the top of the base to make a printingmaterial move to a forward direction; a feeding roller mechanism beinginstalled in a rear of the base, said feeding roller mechanism beingoperable to send the printing material through the top of the base, saidfeeding roller mechanism including a rear bobbin axil; a rewindingroller mechanism operable for rewinding the printing material from thetop of the base; at least one rear guiding roller mechanism beingdisposed at the rear of the base, said at least one rear guiding rollermechanism being coupled with the transfer axil; a rear feeding deviceincluding a rear tension mechanism which is disposed at a bottom of therear of the legs operable to rotate eccentrically in a predeterminedangle, a rear position sensor installed at a predetermined position ofthe rear tension mechanism to correspond to a rear eccentric axis of therear tension mechanism winding the printing material, and a feedingmotor installed on the top of the rear tension mechanism operable todrive said rear bobbin axil combined with a rear bobbin operable to feedthe printing material by receiving signals from the rear positionsensor; at least one front guiding roller mechanism being disposed atthe front of the base, linked with the transfer axil; and a frontrewinding device including a front tension mechanism which is disposedat the bottom of the front of the legs operable to rotate eccentricallyin a predetermined angle, a front position sensor installed at apredetermined position of the front tension mechanism to correspond to afront eccentric axis of the front tension mechanism winding the printingmaterial, and a rewinding motor installed on the top of the fronttension mechanism to drive a front bobbin axis of the rewinding rollermechanism combined with a front bobbin rewinding the printing materialby receiving signals from the front position sensor wherein a diameterof the front roller of the front guiding roller mechanism linkeddirectly with the transfer axil is slightly larger than a correspondingdiameter of the rear roller of the rear guiding roller mechanism.
 5. Adigital textile printer, comprising: a base; legs contacted with theground which support said base; a transfer belt having a rail shapebeing disposed on a top of the base; a cartridge being transferable viathe transfer belt; a head unit being fixed at a side of the cartridge; adriving panel being installed on the top of the base; a transfer motorbeing housed in said driving panel; a transfer axil having an elongatedshape being coupled with said transfer motor; multiple transfer rollersbeing disposed on the transfer axil, said transfer rollers protruding tothe top of the base to make a printing material move to a forwarddirection; a feeding roller mechanism being installed in a rear of thebase, said feeding roller mechanism being operable to send the printingmaterial through the top of the base, said feeding roller mechanismincluding a rear bobbin axil; a rewinding roller mechanism operable forrewinding the printing material from the top of the base; at least onerear guiding roller mechanism being disposed at the rear of the base,said at least one rear guiding roller mechanism being coupled with thetransfer axil; a rear feeding device including a rear tension mechanismwhich is disposed at a bottom of the rear of the legs operable to rotateeccentrically in a predetermined angle, a rear position sensor installedat a predetermined position of the rear tension mechanism to correspondto a rear eccentric axis of the rear tension mechanism winding theprinting material, and a feeding motor installed on the top of the reartension mechanism operable to drive said rear bobbin axil combined witha rear bobbin operable to feed the printing material by receivingsignals from the rear position sensor; at least one front guiding rollermechanism being disposed at the front of the base, linked with thetransfer axil; a front rewinding device including a front tensionmechanism which is disposed at the bottom of the front of the legsoperable to rotate eccentrically in a predetermined angle, a frontposition sensor installed at a predetermined position of the fronttension mechanism to correspond to a front eccentric axis of the fronttension mechanism winding the printing material, and a rewinding motorinstalled on the top of the front tension mechanism to drive a frontbobbin axis of the rewinding roller mechanism combined with a frontbobbin rewinding the printing material by receiving signals from thefront position sensor; and an ink-retrieving hole having an elongatedshape being disposed on the top of the base to collect residues ofinjected ink passing though the printing material.
 6. The digitaltextile printer according to claim 1, further comprising a heater ofrubber material being disposed inside of the base to dry promptly theprinting material.
 7. The digital textile printer, comprising: a base;legs contacted with the ground which support said base; a transfer belthaving a rail shape being disposed on a top of the base; a cartridgebeing transferable via the transfer belt; a head unit being fixed at aside of the cartridge; a driving panel being installed on the top of thebase; a transfer motor being housed in said driving panel; a transferaxil having an elongated shape being coupled with said transfer motor;multiple transfer rollers being disposed on the transfer axil, saidtransfer rollers protruding to the top of the base to make a printingmaterial move to a forward direction; a feeding roller mechanism beinginstalled in a rear of the base, said feeding roller mechanism beingoperable to send the printing material through the top of the base, saidfeeding roller mechanism including a rear bobbin axil; a rewindingroller mechanism operable for rewinding the printing material from thetop of the base; at least one rear guiding roller mechanism beingdisposed at the rear of the base, said at least one rear guiding rollermechanism being coupled with the transfer axil; a rear feeding deviceincluding a rear tension mechanism which is disposed at a bottom of therear of the legs operable to rotate eccentrically in a predeterminedangle, a rear position sensor installed at a predetermined position ofthe rear tension mechanism to correspond to a rear eccentric axis of therear tension mechanism winding the printing material, and a feedingmotor installed on the top of the rear tension mechanism operable todrive said rear bobbin axil combined with a rear bobbin operable to feedthe printing material by receiving signals from the rear positionsensor; at least one front guiding roller mechanism being disposed atthe front of the base, linked with the transfer axil; a front rewindingdevice including a front tension mechanism which is disposed at thebottom of the front of the legs operable to rotate eccentrically in apredetermined angle, a front position sensor installed at apredetermined position of the front tension mechanism to correspond to afront eccentric axis of the front tension mechanism winding the printingmaterial, and a rewinding motor installed on the top of the fronttension mechanism to drive a front bobbin axis of the rewinding rollermechanism combined with a front bobbin rewinding the printing materialby receiving signals from the front position sensor; a front/rearrotation axil installed eccentrically between two front/rear bracketswith a predetermined length, penetrating two front/rear brackets, andboth ends of the front/rear rotation axil combined with the front/rearfixtures; multiple front/rear adjusting holes between the two front/rearbrackets; and a front/rear tension adjusting axil being installed in oneof the multiple front/rear adjusting holes to balance with a weight ofthe front/rear eccentric axil, and to adjust a tension strength of thefront/rear eccentric axil.